Magneto



March 30,1926; 1,578,548

' A. ROSNER MAGNETO Filed Dec. '7, 1921 INVENTOR' I ADOLPH ROSNER.

ATTORNEY Fatented Mar. '0, 192%.

UNITED STATES ADOLPH KOSHER, SPRINGFIELD, MASSACHUSETTS, ASSLGNUB! TOAMERICAN Boson: MAGNETO conronarron, or PORATION on NEW YORK.

SPRINGFIELD, LlEASSACI-TUSET'IS A COR- MAGNETO.

Application filed December To all whom it may cone-em."

Be it known that I, ADoLrH RosNnn, a citizen of the United States,residing at 4 Ventura Street, Springfield, in the county of Hampden,State of Massachusetts, have invented certain new and usefulImprovements in Magnetos; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

The present invention relates to magnetos of the rotary or oscillatingtype, and particularly to certain structural parts thereof, such as theinterrupter mechanism and the cap therefor.

l-lerctofore it was customary to have a combined interrupter housing andbearing member, which was detachably fastened to the frame housing andpositioned therein by a fit ring, and in magnetos arranged for fixedignition, the cam or cams were some times fastened to that detachablemember. In accordance with my invention, a onepiece frame providesintegral housings for both the rotor and the interrupter, whereas aremovable bearingjmember is fastened in position in the interrupterhousing for supporting one end of the rotor, the cam or cams beingcarried by or being integral with the bearing member. The bearingcarrying member is preferably angularly adjustable in the frame of themagneto for adjustment of the edge distance, as more specificallypointed out in co-pending application, Serial No. 520,700 filedconcurrently herewith.

In the accompanying drawing illustrating my invention in application, asan example, to a single cylinder magneto of the rotary armature typearranged for one spark per re elation;

Fig. 1 is a view in side elevation of the magneto; Fig. 2 is alongitudinal section of the same; Figs. 3 and i are detail views of anend cap, retaining spring and an interrupter cam.

In this embodiment of the invention, the magneto comprises a U-shapedpermanent magnet 1 supported upon a frame 2, preferably made of aluminumand of the general form of a cylinder or tube having a closed endportion 3 and an opened end portion l. iVithin the frame 2 is rotatablysupported an armature 5 of usual construc- 7, 1921. Serial No. 520,701.

tion having a shaft of which portion 6 is supported in a ball bearing 7,seated in the closed end 3 of the frame 2, and shaft portion 8 issupported in a ball bearing 9 mounted in a bearing supporting ring 10seated in the frame 2 against an internal annular shoulder 11. Thearmature also carries, near the shaft portion 6, a collector 12, and atits other end, near the shaft portion 8, a condenser 13. hen casting theframe 2, the pole shoes are cast with the frame.

At the top of the casing 2 are provided oil cups 1a and 15 adapted tosupply a lubricant to the bearings 7 and 9, by means of conducting wicks16 and 17, as is clearly shown in Fig. 2 of the drawing. The casing alsocarries, above the collector 12, a collector brush holder 18 formed ofinsulating material, such as bakelite, and having a metal insertelectrode 19 recessed at its outer end to receive a terminal of a hightension lead and connected at its inner end by a spring 20 to acollector brush 21, the latter being rectangular in cross-section, sothat its greatest dimension is in the plane of rotation of the collectorspool, and its shortest dimension isaxially of the armature of themagneto. The brush 21 bears against a metal track 22 forming part of thespool 12. In order to form a water shed for the collector and preventingwater from having access to the interior of the magneto,the collectorbrush holder is formed with a skirt portion 23, which overhangs anannular or upwardly extending portion 24 of the frame 2, as is clearlyshown in Fig. 2 of the drawing. The frame also carries a grounding brush25 extending inwardly into contact with the condenser casing which iselectrically connected to oneside of the condenser.

The shaft portion 8 extends through the bearing 9 and carries aninterrupter mechanism 26 which extends beyond the open end of theoutside of the bearing 9 and ring 10. The interrupter is held in placeby an end fastening screw 27 in a known manner, and is partly surroundedby a relatively stationary cam 28 which operates to deflect theinterrupter lever, and hence separate the contact points, thus effectinga breaking of the circuit of the primary winding of the armature. Inthis construction the cam 28 is formed integral with the ring 10 and exframe 2 and adjacent but tends outwardly from such ring around a portionof the interrupter mechanism. In the embodiment shown, the magneto is ofthe rotary armature type for use with a sin-' gle cylinder engine,although the invention is applicable to an oscillating type of magnetoand also to a magneto connected to a multi-cylinder engine, in whichcase either a greater number of cams may be used or the speed ofrotation of the magneto increased. The cam 28 is shown as arc-shapedwith an inner cam surface 29 adapted to cooperate with the interrupterlever. This cam is intended for fixed ignition operation. At the base ofthe cam is provided an aperture in which is located an oil wick 30adapted to supply the oil through apertures 31 to the face 29 of thecam. It will be noted that the outer end 4 forming the interrupterhousing of the frame 2 is short, so that the interrupter mechanism andthe cam 28 project beyond the open end 4 and greater accessibility tothe interrupter, both axially and radially, can be obtained. In order tocover the interrupter mechanism and the cam, an interrupter cap 32 ofdome shape is connected with its flanged portion 33 extending into theopen end 4 of the frame 2 and bearing upon the outer face of the bearingholding ring 10, the cover cap 32 thus also holding the ring 10 in placeagainst the shoulder 11. The cap 32 is held in position by a spring bail34, shown in detail in Fig. 3, this bail having at its ends trunnions 35resiliently fitting into recesses formed in the sides of the frame 2.This bail is so constructed that when once connected in place it neednever be disconnected, but is swung about the axis of the trunnions 35to be engaged with or disconnected from the cap 32, the bail beingcapable of springing for such'purpose. The cap 32 has at its centralouter portion, a depression 36 into which the central portion 37 of thebail may snap when the latter is connected to the cap. The cap ispreferably made of sheet metal and drawn to the shape shown; 7

When inserting the member 10 in place and connecting the interrupter tothe shaft portion 8 by the end screw 27, the member 10, which carriesthe cam 28, may be adjusted angularly to a certain extent. This ispermitted by providing the frame 2 with lateral openings 38, throughwhich extend screws 39 into the member 10, the diameter of the apertures38 being greater than the diameter of the shanks of the screws 39, sothat a certain amount of angular play or movement is permitted foradjusting the relation of the cam wit-h respect to the interruptermechanism, so that the contact points will be opened at the instant whenthe pole shoes of the magnet and the core extensions of the armature areseparated a given distance, called the edge distance. Adjustment for thelatter is made by turning the member 10 in the housing 2 to the pointwhen the edge distance is of the amount desired, and also when the camis holding the contact points open. The screws 39 then are drawn uptight, so as to hold the member 10 fast, and a hole 40 drilled into thelower part of the ring 10, after which a lock pin 41 is inserted in thishole through the lower portion 4 of the frame 2, so as to lock andmaintain the ring 10 in adjusted relation.

Having thus described my invention what I claim is:

1. A magneto comprising a permanent magnet, a rotor cooperative with themagnet, an interrupter cooperative with the rotor, a frame, a bearingmember fastened in the frame for supporting one end of the rotor, andmeans for angularly adjusting the bearing member in the frame, the camelement of the interrupter being "fastened rigidly to the bearingmember, whereby adjustment of the bearing member adjusts the edgedistance of the magneto.

2. A magneto comprising a permanent magnet, a rotor cooperative with themag net, .an interrupter cooperative with the rotor, a frame, a bearingmember fastened 9 in the frame for supporting one end of the rotor,means for angularly adjusting the bearing member in the frame, the camelement of the interrupter being fastened rigidly to the bearing member,whereby adjustment of the bearing member adjusts the edge distance ofthe magneto, and means for locking the bearing member in adjustedpositlon.

In testimony ture.

whereof I aiiix my signa- ADOLPH ROSNER.

